NOTE: ANSWER ALL. I'll leave a like. Previous answers are always incomplete and wrong.  a.  Out of 7 consonants and 4 vowels, how many words of 3 consonants and 2 vowels can be formed? b. In a group of 6 boys and 4 girls, four children are to be selected. In how many ways can they be selected such that at least one boy should be there?

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